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payabl.

Senior Backend Developer – Services

payabl.

Senior Python Backend Developer designing scalable microservices and transforming legacy systems. Collaborating with teams to ensure high reliability and maintainability in backend architecture.

Posted 6/22/2026full-timeRemote • 🇵🇱 PolandSeniorWebsite

Tech Stack

Tools & technologies
DockerGoJavaScriptKafkaKubernetesMicroservicesMySQLPerlPHPPostgresPythonRedis

About the role

Key responsibilities & impact
  • Legacy Modernisation: Read legacy code (PHP, Perl, or JavaScript), extract the business logic, and reimplement it correctly within a modern microservices architecture.
  • Reliability First: Ensure idempotency, data integrity, and graceful error handling across all services — "almost working" is never good enough.
  • Greenfield & Refactoring: Split your time between building new features from scratch and refactoring existing legacy modules into clean, maintainable code.
  • API Engineering: Design and consume external APIs with a deep understanding of webhooks, callbacks, and complex retry policies.
  • Agile Collaboration: Maintain clean and strong English communication to effectively collaborate with multiple stakeholders across departments working in agile sprints.
  • Product Thinking: Go beyond the "what" and "how" of the code — bring a product-focused mindset to understand the business logic and end-user impact of what you build.
  • Infrastructure Contribution: Contribute to CI/CD pipelines, Docker, or Kubernetes infrastructure where relevant. If you have a passion for infra, you are more than welcome to bring it.
  • Innovation: Propose and advocate for tools or technologies that can demonstrably improve our performance, security, or development speed.

Requirements

What you’ll need
  • Python Mastery: 5+ years of backend engineering experience with strong Python expertise. Deep AsyncIO proficiency — you must be comfortable building non-blocking, high-reliability microservices.
  • Framework Expertise: Production-grade experience with FastAPI (not just familiarity).
  • Databases: Experience with MySQL and/or PostgreSQL — query design, schema understanding, and migration strategies.
  • Testing Discipline: Experience writing unit and integration tests (pytest preferred).
  • API & Reliability Patterns: Expertise in designing and consuming external APIs with a deep understanding of webhooks, callbacks, and complex retry policies.
  • Ownership Mindset: Willingness to take full ownership of high-traffic, always-up applications and operate independently within an established architectural vision.
  • Confidence in Complex Systems: Comfortable in complex distributed environments where reliability is non-negotiable.
  • Clean & Intentional Code: We value deep engineering logic over AI-generated snippets. You must be able to explain the reasoning behind every line you ship.
  • Curiosity for Product: You care about the "why" behind a feature — how it works for the end-user and what it means for the business.
  • Strong English: Both written and verbal to collaborate effectively across multi-functional teams.
  • Nice to Have: Experience with PHP, Perl, or JavaScript — a strong bonus signal for legacy comprehension.
  • Kafka / Redis experience.
  • Docker / CI/CD / Kubernetes familiarity.
  • Financial industry exposure — fintech, payments, 3DS, Token Management Systems, or payment gateway integrations.
  • Track record of successfully migrating systems from one language or paradigm to another.

Benefits

Comp & perks
  • Grow with Us: Annual Learning Budget for professional development (eligible after probation)—because your growth is our growth.
  • Celebrate Together: We bring colleagues from all offices together for unforgettable company celebrations.
  • Global Collaboration & Events: Opportunities to participate in international company events and initiatives, connecting with colleagues from all regions and contributing to a truly global community

ATS Keywords

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Hard Skills & Tools
PythonAsyncIOFastAPIMySQLPostgreSQLunit testingintegration testingwebhookscallbacksmicroservices
Soft Skills
ownership mindsetconfidence in complex systemscuriosity for productstrong English communicationproduct thinkingagile collaborationinnovation